Crystal system 'A' has all the edge lengths as same, a=b=c. Which of the following is the possible crystal system for the given crystal 'A'?
A
Cubic
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B
Rhombohedral
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C
Both (a) and (b)
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D
None of the above
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Solution
The correct option is C Both (a) and (b) For 3D-space lattice, there are seven unique and basic unit-cell shapes (primitive unit cells) with varying elements of symmetry in a three-dimensional space.
Out of 7 crystal system, only cubic and rhombohedral has same edge length for all the sides.
Cubic crystal system: a=b=c;α=β=γ=90o
NaCl,ZnS and Cu are examples of cubic crystals.
Rhombohedral crystal system: a=b=c;α=β=γ≠90o
Calcite and HgS are examples of rhombohedral crystals.